Operating Instructions
Temperature measurement
CombiTemp™
TFRH/N
RTD temperature sensor
7.2
Explosive gas atmospheres zone 2
The TFRH/N can be used in explosion hazardous areas of zone 2 without using Zener barriers.
Approval for
TFRH/N-xxxx.x3xx.xxxx.xxxx.xxxx
:
ATEX II 3
G Ex ec IIC T5...T4
All TFRH/N with protection class
ec
f
Comply with the following temperatures and
connection values.
Ex
ec
II T4/T5
Supply range
Un: 30 V max.
In: 100 mA max.
Temperature class
T1 … T4:
–
20
≤
Tamb
≤
70 °C
T5: –20
≤
Tamb
≤
60 °C
7.3
Simple apparatus (no display, no transmitter)
The TFRH/N without transmitter (Pt100 output) and without display can be used in explosion hazardous
areas of zone 0, 1 and 2. Zener barrier must be used for all zones.
Approval for TFRH/N-xxxx.x9xx.xxxx.xxxx.xxxx: Ex ia simple apparatus
Da /
Gc
All TFRH/N in Zone 0, zone 1 and zone 2
f
Use Zener barrier.
f
Comply with the following temperatures,
connection values and circuit diagram.
Ex ia simple apparatus
(IEC 60079-11)
Limit values
Ui: 15 V
Ii: 50 mA
Pi: 25 mW
Li: 0 μH
Ci: 0 nF
Temperature class
T1 … T5:
–
40
≤
Tamb
≤
75 °C
T6: –40
≤
Tamb
≤
60 °C
1
2-wire
2-wire
3-wire
4-wire
3
2
4
Function
Pin
Pt100 11
1, 2
Pt100 12
3, 4
12 /
54
www.baumer.com
